CN114641654A

CN114641654A - Light source device

Info

Publication number: CN114641654A
Application number: CN202080076158.0A
Authority: CN
Inventors: 吉田典正; 冈久强志
Original assignee: Nichia Corp
Current assignee: Nichia Corp
Priority date: 2019-10-30
Filing date: 2020-09-09
Publication date: 2022-06-17
Also published as: US11867390B2; US20240044473A1; JP2021072207A; EP4053600A4; JP2023054077A; US20220252238A1; JP7460936B2; EP4053600A1; WO2021084919A1; JP7231831B2

Abstract

The invention provides a light source device. A light source device (100) is provided with: a plurality of light emitting devices that can be independently lighted, a first lens (11) that is disposed so as to face the plurality of light emitting devices, and a second lens (31) that is disposed so as to face the first lens (11), wherein the lower surface of the first lens (11) that faces the plurality of light emitting devices has: the lens includes an incident portion (12) disposed at the center and into which light from the plurality of light-emitting devices is incident, and a light guide portion (21) disposed outside the incident portion (12) and guiding the light incident from the incident portion (12), wherein the lower surface of the second lens (31) facing the first lens (11) has a Fresnel lens surface (32) formed of a plurality of annular convex portions (34).

Description

Light source device

Technical Field

The present disclosure relates to a light source device.

Background

Light sources using light emitting devices such as light emitting diodes have been widely used. For example, patent document 1 discloses a small light source device that can be applied to a flash of a mobile phone.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication No. 2010-238837

Disclosure of Invention

Technical problem to be solved by the invention

An object of an embodiment of the present disclosure is to provide a light source device that can selectively irradiate light in a desired direction.

Technical solution for solving technical problem

In order to solve the above problem, a light source device according to an embodiment of the present disclosure includes: a plurality of light emitting devices that can be independently lighted, a first lens disposed to face the plurality of light emitting devices, and a second lens disposed to face the first lens, wherein a lower surface of the first lens that faces the plurality of light emitting devices includes: and a light guide portion disposed outside the incident portion and guiding light incident from the incident portion, wherein a lower surface of the second lens facing the first lens has a fresnel lens surface formed by a plurality of annular convex portions.

In addition, the light source device of the embodiment of the present disclosure includes: a plurality of light emitting devices that can be independently lighted, and a first lens that is disposed so as to face the plurality of light emitting devices, wherein a lower surface of the first lens that faces the plurality of light emitting devices includes: and a light guide portion disposed outside the incident portion and guiding light incident from the incident portion, wherein an upper surface of the first lens on a side opposite to a lower surface thereof has a Fresnel lens surface formed by a plurality of annular convex portions.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the light source device of the embodiment of the present disclosure, a light source device that can selectively irradiate light in a desired direction can be provided.

Drawings

Fig. 1 is a sectional view schematically showing the structure of a light source device according to a first embodiment.

Fig. 2 is a plan view of the light source device of the first embodiment with a housing omitted as viewed from the second lens side.

Fig. 3 is a plan view showing the arrangement of a plurality of light emitting devices of the light source device of the first embodiment.

Fig. 4A is a cross-sectional view taken along line IVA-IVA of fig. 3.

Fig. 4B is a cross-sectional view schematically showing another structure of the light-emitting device of the light source device of the first embodiment.

Fig. 5 is a plan view of the light source device of the first embodiment as viewed from the light emitting device side of the first lens.

Fig. 6 is a plan view of the light source device of the first embodiment as viewed from the first lens side of the second lens.

Fig. 7A is a plan view of the light source device of the first embodiment, showing the positional relationship between the first and second lenses and one light emitting device 1e on the center side of the lit state, with the housing omitted, as viewed from the second lens side.

Fig. 7B is a cross-sectional view schematically showing an optical path of the light source device of fig. 7A.

Fig. 7C is a schematic diagram showing an illuminance distribution of the light source device of fig. 7B.

Fig. 8A is a plan view of the light source device of the first embodiment, showing the positional relationship between the first and second lenses and the one light-emitting device 1b on the lighted side, and omitting the housing, as viewed from the second lens side.

Fig. 8B is a cross-sectional view schematically showing an optical path of the light source device of fig. 8A.

Fig. 8C is a schematic diagram showing an illuminance distribution of the light source device of fig. 8B.

Fig. 9A is a plan view of the light source device of the first embodiment, showing the positional relationship between the first and second lenses and one light emitting device 1c on the lighted corner portion side, with the housing omitted, as viewed from the second lens side.

Fig. 9B is a cross-sectional view schematically showing an optical path of the light source device of fig. 9A.

Fig. 9C is a schematic diagram showing an illuminance distribution of the light source device of fig. 9B.

Fig. 10 is a sectional view schematically showing the structure of a light source device according to a second embodiment.

Fig. 11 is a sectional view schematically showing the structure of a light source device according to a third embodiment.

Fig. 12 is a sectional view schematically showing the structure of a light source device according to a fourth embodiment.

Fig. 13 is a cross-sectional view schematically showing the structure of a light source device according to a fifth embodiment.

Fig. 14 is a sectional view schematically showing the structure of a light source device according to a sixth embodiment.

Fig. 15 is a sectional view schematically showing the structure of a light source device according to a seventh embodiment.

Fig. 16 is a sectional view schematically showing the structure of a light source device according to the eighth embodiment.

Fig. 17A is a cross-sectional view schematically showing the structure of a light source device according to a ninth embodiment.

Fig. 17B is a plan view of the light source device of the ninth embodiment, as viewed from the light-emitting device side of the first lens.

Fig. 18A is a schematic diagram showing a lighting state of the light emitting devices of the light source device of the embodiment, and showing a case where all the nine light emitting devices 1a to 1i are lighted.

Fig. 18B is a schematic diagram showing an illuminance distribution of the light source device of fig. 18A.

Fig. 19A is a schematic diagram showing a lighting state of the light emitting devices of the light source device of the embodiment, and showing a case where eight light emitting devices 1a to 1d, 1f to 1i among the nine light emitting devices 1a to 1i are already lit.

Fig. 19B is a schematic diagram showing an illuminance distribution of the light source device of fig. 19A.

Fig. 20A is a schematic diagram showing a lighting state of the light emitting devices of the light source device of the embodiment, and showing a case where five light emitting devices 1a to 1c, 1f, 1i among nine light emitting devices 1a to 1i are lighted.

Fig. 20B is a schematic diagram showing an illuminance distribution of the light source device of fig. 20A.

Detailed Description

A light source device according to an embodiment of the present invention will be described with reference to the drawings. However, the following embodiments are illustrative of the light source device for embodying the technical idea of the present embodiment, and are not limited to the following embodiments. It should be noted that the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments are not specifically described, and the scope of the present invention is not intended to be limited thereto, but is merely an illustrative example. The sizes, positional relationships, and the like of the components shown in the drawings may be exaggerated for clarity of description. In the following description, the same names and symbols indicate the same or similar members, and detailed description thereof will be omitted as appropriate.

< first embodiment >

As shown in fig. 1 and 3, a light source device 100 of the first embodiment includes: a plurality of light emitting devices 1a to 1i capable of lighting independently, a first lens 11 disposed to face the plurality of light emitting devices 1a to 1i, and a second lens 31 disposed to face the first lens 11, wherein a lower surface of the first lens 11 facing the light emitting devices 1a to 1i has: the light guide unit includes an incident portion 12 disposed at the center and into which light from the plurality of light emitting devices 1a to 1i is incident, and a light guide portion 21 disposed outside the incident portion 12 and guiding the light incident from the incident portion 12, and a lower surface of the second lens 31 facing the first lens 11 has a fresnel lens surface 32 formed of a plurality of annular convex portions 34.

Further, the light source device 100 may include: a substrate 41 on which the plurality of light emitting devices 1a to 1i are mounted, and a housing 51 covering the opening 52 and the second lens 31 in an opposed manner. The first lens 11 is preferably fixed to the substrate 41. In the light source device 100, the second lens 31 is preferably fixed to the first lens 11 fixed to the substrate 41. Next, each configuration of the light source device will be described.

(light-emitting device)

The plurality of light emitting devices are mounted on the substrate 41 as the light emitting devices 1a to 1i that can be independently lighted. As shown in fig. 3, the plurality of light emitting devices 1a to 1i are preferably arranged in a rectangular shape as a whole in a plan view. Further, the plurality of light emitting devices 1a to 1i are preferably arranged in a square lattice shape or a rectangular lattice shape having two or more rows and two or more columns. For example, four or nine light-emitting devices are preferably arranged at equal intervals in the longitudinal and lateral directions, and the entire light-emitting device is preferably a rectangular region viewed from above.

As shown in fig. 4A, the light-emitting device 1a is mounted on a substrate 41 with the upper surface serving as a light-emitting surface and the lower surface on the opposite side of the upper surface serving as a mounting surface. The light-emitting device 1a includes: the light emitting device includes a light emitting element 2, a transparent member 4 provided on an upper surface of the light emitting element 2, and a cover member 5 covering a side surface of the light emitting element 2 and a side surface of the transparent member 4 except for the upper surface of the transparent member 4. As shown in fig. 4B, the side surface of the transparent member 4 may be exposed from the cover member 5. The light-emitting element 2 is preferably provided with positive and negative electrodes 3 on the lower surface on the side opposite to the upper surface. The light-emitting device 1a may have a square shape in plan view, for example, but may have a polygonal shape such as a circle, an ellipse, a triangle, or a hexagon. The light-emitting devices 1b to 1i also have the same configuration as the light-emitting device 1 a. Instead of mounting a plurality of light-emitting devices on the substrate 41, one light-emitting device having a plurality of light-emitting elements 2 may be mounted on the substrate 41. For example, a plurality of light emitting elements 2 having the light transmitting member 4 may be arranged at equal intervals in the longitudinal and lateral directions and integrally formed as one light emitting device by the cover member 5. In this case, the plurality of light emitting elements 2 may be mounted on the substrate 41 so as to be independently turned on.

The light-emitting element 2 is preferably formed of various semiconductors such as group III to V compound semiconductors and group II to VI compound semiconductors. As the semiconductor, In is preferably used_XAl_YGa_1-X-YNitride semiconductors such as N (0 ≦ X, 0 ≦ Y, X + Y ≦ 1) and InN, AlN, GaN, InGaN, AlGaN, InGaAlN, and the like can be used.

The light transmitting member 4 is a plate-like member having a substantially rectangular shape in plan view, and is provided so as to cover the upper surface of the light emitting element 2. The light-transmitting member 4 may be formed using an inorganic substance such as a light-transmitting resin material, ceramic, or glass. As the resin material, a thermosetting resin such as a silicone resin, a silicone-modified resin, an epoxy resin, and a phenol resin can be used. In addition, thermoplastic resins such as polycarbonate resin, acrylic resin, methylpentene resin, polynorbornene resin, and the like can be used. In particular, a silicone resin or a modified resin thereof having good light resistance and heat resistance is most preferable. The light-transmitting property mentioned here means that light from the light-emitting element 2 can be transmitted by 60% or more. The transparent member 4 may include a light diffusing member and a phosphor that converts at least a part of the light from the light emitting element 2 into a wavelength. Examples of the light transmitting member 4 containing a phosphor include a material containing a phosphor such as the above-mentioned resin material, ceramic, or glass, and a fired body of a phosphor. The transparent member 4 may be formed with a resin layer containing a fluorescent material and a light diffusion member on the lower surface of a molded body made of resin, glass, ceramic, or the like.

For example, by using a blue light emitting element as the light emitting element 2 and containing a yellow phosphor in the transparent member 4, the light emitting device 1 emitting white light can be obtained.

The phosphor contained in the transparent member 4 is, for exampleMay be exemplified by Y₃Al₅O₁₂: YAG phosphor represented by Ce, yellow phosphor such as silicate, or CaAlSiN 3: CASN phosphor expressed by Eu, K₂SiF₆: a red phosphor such as KSF phosphor represented by Mn.

As the light diffusion member contained in the transparent member 4, for example, titanium dioxide, barium titanate, alumina, silica, or the like can be used.

The cover member 5 covers the side surfaces of the light emitting element 2 and the transparent member 4, and directly or indirectly covers the side surfaces of the light emitting element 2 and the transparent member 4. The upper surface of the light-transmitting member 4 is exposed from the cover member 5, and constitutes a light-emitting surface (i.e., a main light extraction surface) of the light-emitting device 1. The covering member 5 is preferably made of a member having high light reflectance in order to improve light extraction efficiency. For example, a resin material containing a light reflecting substance such as a white pigment can be used as the covering member 5. Examples of the light-reflecting substance include titanium dioxide, zinc oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, barium titanate, barium sulfate, aluminum hydroxide, alumina, zirconia, silica, and the like, and it is preferable to use one of the above substances alone or two or more of the above substances in combination. As the resin material, a resin material containing a thermosetting resin such as an epoxy resin, a silicone-modified resin, or a phenol resin as a main component is preferably used as a base material.

The covering member 5 may be formed of a member having optical transparency to visible light, if necessary.

(first lens)

The first lens 11 is disposed to face the light emitting surfaces of the light emitting devices 1a to 1 i. The first lens 11 collects light from the plurality of light emitting devices 1a to 1i and emits the collected light toward the second lens 31. The first lens 11 may be a collimator lens, for example. The first lens 11 is preferably formed of a transparent resin such as a polycarbonate resin, an acrylic resin, a silicone resin, and an epoxy resin. The shape of the first lens 11 is preferably circular or elliptical in plan view, and may be polygonal such as quadrangular or hexagonal.

The first lens 11 includes, on a lower surface side facing the plurality of light emitting devices 1a to 1 i: an incident portion 12 disposed at the center and into which light from the light emitting devices 1a to 1i is incident, and a light guide portion 21 disposed concentrically outside the incident portion 12 and guiding light incident from the incident portion 12. When the light source device 100 is used as a flash light source of a mobile phone, the lower surface of the first lens 11 is preferably in a four-fold rotationally symmetrical shape in plan view, considering that the imaging range of a normal camera is rectangular. The lower surface of the first lens 11 may have a shape that is rotationally symmetric twice in plan view.

The incident portion 12 is a concave portion formed on the lower surface of the first lens 11 and having a size including the plurality of light emitting devices 1a to 1i in a plan view. The shape of the bottom surface of the recess of the incident portion 12 is preferably quadrangular in plan view, and may be circular, elliptical, triangular, quadrangular, hexagonal, or the like. The bottom surface of the recess is preferably formed as a fresnel lens surface. That is, the incident portion 12 preferably has: a lower surface convex portion 14 arranged at the center and convex toward the light emitting devices 1a to 1i, and a corner portion 16 arranged concentrically around the lower surface convex portion 14 and convex toward the light emitting devices 1a to 1 i. The corner portions 16 are preferably arranged continuously or intermittently in a concentric manner around the lower surface convex portion 14. The corner 16 is formed in a concentric circle shape of one circle, but may be formed in a plurality of circles. By having the corner portion 16, the radius of the lower surface convex portion 14 can be reduced, so that light from the light emitting devices 1a to 1i can be introduced more, and the light condensing property is improved. The inner surface 22 of the recess is preferably a flat surface, but may be a curved surface.

The light guide unit 21 is disposed outside the incident unit 12 on the lower surface side of the first lens 11. The light guide unit 21 has an inclined surface 23 that reflects light incident from the incident unit 12. Light guide unit 21 is preferably formed in a ring shape continuously or intermittently in a concentric circle shape around incident unit 12. This allows light having a large emission angle and being emitted outside a desired irradiation range among the light emitted from the light emitting devices 1a to 1i to be collected by the light guide unit 21, thereby improving the light extraction efficiency. The inclination angle of the inclined surface 23 with respect to the optical axis is set to an angle at which light from the light emitting devices 1a to 1i is collected, incident, and reflected.

The upper surface of the first lens 11 preferably has: an upper surface convex portion 17 disposed at the center and projecting toward the second lens 31 side, and a flat portion 19 disposed around the upper surface convex portion 17 and disposed via an upper surface concave portion 18 continuous with the upper surface convex portion 17. The upper surface concave portion 18 is preferably formed in a concave annular surface shape concentrically around the upper surface convex portion 17. In addition, the upper surface convex portion 17 is preferably formed larger than the lower surface convex portion 14 in a plan view. Since the first lens 11 has the upper surface convex portion 17, light incident from the lower surface convex portion 14 and/or the corner portion 16 of the incident portion 12 can be easily extracted toward the second lens side. Further, since the first lens 11 has the upper surface concave portion 18, the light reflected by the inclined surface 23 can be easily extracted toward the second lens side. Further, by having the upper surface recess 18, the inclination angle of the inclined surface 23 with respect to the optical axis can be further reduced. This makes it possible to reduce the lens diameter of the first lens 11 and, consequently, the lens diameter of the second lens 31. Further, the diameter of the opening 52 of the housing 51 can be reduced. This makes it difficult to see the inside of the opening 52, thereby improving the appearance.

As shown in fig. 5, the first lens 11 includes: the light guide unit includes a first main body portion 24 having the incident portion 12 and the light guide portion 21, and a first side edge portion 25 extending laterally from an outer edge of the first main body portion 24. First side edge 25 preferably has first upper region 25a and first leg region 25b extending from first upper region 25a toward substrate 41. The first side edge portion 25 extends laterally from the outer edge of the first body portion 24, and is formed in a ring shape surrounding the first body portion 24. The upper portion of the first upper region 25a is formed flat and at the same height as the upper end of the upper surface protrusion 17 of the first body portion 24. The first leg portion region 25b is, for example, formed in a cylindrical shape so as to be continuous with the side of the first upper portion region 25 a. Thus, in the first lens 11, the lower surface of the first leg region 25b of the first side edge portion 25 and the upper surface of the substrate 41 can be fixed via the adhesive member 61, and the upper surface of the first upper region 25a of the first side edge portion 25 and the lower surface of the second lens 31 can be fixed via the adhesive member 61. Here, the adhesive member 61 may be made of a known adhesive material such as tape. The first body portion 24 and the first side edge portion 25 of the first lens 11 are integrally formed by machining the same member as an example. The first body portion 24 and the first side edge portion 25 may be formed of different materials, and for example, the first body portion 24 may be formed of a light-transmitting resin or a glass material, and the first side edge portion 25 may be formed of a metal such as an aluminum alloy.

(second lens)

The second lens 31 is disposed to face the first lens 11, and refracts light emitted from the first lens 11 to emit the light into a desired irradiation range. The second lens 31 is preferably formed of a light-transmitting resin such as a polycarbonate resin, an acrylic resin, a silicone resin, and an epoxy resin, as in the case of the first lens 11. The outer shape of the second lens 31 is preferably circular or elliptical in plan view, and may be polygonal such as quadrangular or hexagonal.

The second lens 31 is preferably a lens having a convex portion or a concave portion such as a fresnel lens. The second lens 31 has a fresnel lens surface 32 formed by a plurality of annular projections 34 on a lower surface facing the first lens 11. The fresnel lens surface 32 has: a central convex portion 33 which protrudes toward the first lens 11 side, and a plurality of annular convex portions 34 which are concentrically arranged outside the central convex portion 33 and which protrude toward the first lens 11 side. The plurality of annular protrusions 34 are preferably arranged concentrically with respect to the central protrusion 33 in a plan view, and are formed in a shape that is annular along the shape of the central protrusion 33. That is, convex portion 34 is formed in a circular shape in a plan view when central convex portion 33 is circular, and convex portion 34 is formed in a rectangular ring shape in a plan view when central convex portion 33 is rectangular in a plan view. The fresnel lens surface 32 is preferably formed to have a size including the incident portion 12 and the light guide portion 21 of the first lens 11 in a plan view.

As shown in fig. 1 and 6, the second lens 31 preferably includes: a second body portion 37 having a fresnel lens surface 32 on the first lens side and a flat surface 36 on the opposite side of the fresnel lens surface 32 to face the opening 52 of the housing 51, and a second side edge portion 38 extending laterally from the outer edge of the second body portion 37. The second side edge portion 38 preferably has: a second leg region 38a extending from the outer edge of the second body portion 37 toward the first lens 11, and a second attachment region 38b extending continuously from the lower end of the second leg region 38a and laterally. The flat surface 36 is formed to have the same size as or larger than the fresnel lens surface 32 in a plan view, and is formed to have the same height as the upper surface of the housing 51 when the second body portion 37 is inserted into the opening 52 of the housing 51. Further, the flat surface 36 of the second lens 31 may be subjected to a rough surface processing or may be formed with fine irregularities.

The second side edge portion 38 extends laterally from the outer edge of the second body portion 37, and is formed in an annular shape, and the upper surface thereof is formed to be the same as the flat surface 36. The second leg portion region 38a is formed such that the lower end surface is located below the lower surface of the fresnel lens surface 32. The second mounting region 38b extends laterally from the lower side surface of the second leg region 38a and is formed in a ring shape. The lower end of the second mounting region 38b is formed flat and is formed in the same plane as the lower end of the second foot region 38 a. The second mounting region 38b is preferably disposed to face the first upper region 25a of the first lens 11. Thereby, the upper surface of the first side edge portion 25 and the lower surface of the second side edge portion 38 can be fixed via the adhesive member 61. In the second lens 31, a second leg region 38a is formed on the center side of the first lens 11 with respect to the first upper region 25 a. That is, as shown in fig. 2, the second lens 31 is fixed while being included in the first lens 11 in a plan view.

The second lens 31 can be disposed with the first body 24 of the first lens 11 and the second body 37 of the second lens 31 separated from each other by positioning the lower surface of the second leg region 38a below the fresnel lens surface 32. This can suppress interference between the first lens 11 and the second lens 31.

In the second lens 31, it is preferable that the flat surface 36 of the second body portion 37 is inserted into the opening 52 of the housing 51 so as to be exposed, and the outer peripheral surface of the second leg portion region 38a is brought into contact with the inner peripheral surface of the opening 52. In the light source device 100, the lower surface of the second side edge portion 38 of the second lens 31 and the upper surface of the first side edge portion 25 of the first lens 11 are preferably fixed to each other via the adhesive member 61.

(substrate)

The substrate 41 is preferably configured to have a plurality of light emitting devices 1a to 1i mounted thereon and to have wiring 42 arranged on the surface and/or inside thereof. On the substrate 41, the wiring 42 is connected to the positive and negative electrodes 3 of the light emitting devices 1a to 1i via the conductive adhesive member 62, whereby the substrate 41 and the light emitting devices 1a to 1i are electrically connected. The wiring 42 of the substrate 41 has a configuration, a size, and the like set according to the configuration, the size, and the like of the electrodes 3 of the light emitting devices 1a to 1 i.

The substrate 41 is preferably made of an insulating material, and is preferably made of a material that is difficult to transmit light emitted from the light-emitting devices 1a to 1i, external light, or the like, and preferably has a certain level of strength. Specifically, the substrate 41 may be made of a resin such as alumina, aluminum nitride, mullite, or other ceramics, a phenol resin, an epoxy resin, a polyimide resin, a BT resin (bismaleimide triazine resin), or polyphthalamide.

The wiring 42 may be made of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, or an alloy of the above metals. In addition, a layer of silver, platinum, aluminum, rhodium, gold, or an alloy of the foregoing metals may be provided on the surface layer of the wiring 42 in view of wettability and/or light reflectivity of the conductive adhesive member 62.

(case)

The housing 51 covers the opening 52 and the second lens 31 in a manner facing each other, and may be a part of a housing of a mobile phone using the light source device 100 as a flash light source, for example. The opening 52 is preferably formed larger than the second body 37 so as to expose the flat surface 36 of the second body 37 of the second lens 31. The case 51 may have a leg portion 53 for fixing to the substrate 41. The housing 51 is preferably formed of a light blocking member, and is preferably made of a resin material containing a filler such as a light reflecting member or a light absorbing member, for example, in order to restrict the light distribution direction of the light emitted from the light source device 100. The shape of the opening 52 may be, for example, a circle, an ellipse, a triangle, a quadrangle, or a hexagon in plan view.

In the light source device 100, the first lens 11 and the second lens 31 are combined to irradiate light in a desired direction corresponding to the lighting arrangement of the plurality of light emitting devices 1a to 1 i.

For example, as shown in fig. 7A, when one light emitting device 1e arranged at the center of the rectangle among the plurality of light emitting devices arranged in the rectangular shape in plan view is lit, as shown in fig. 7B, light mainly passing through the lower surface convex portions 14 of the first lens 11 is refracted at the upper surface convex portions 17 and the second lens 31, and is irradiated to the rectangular center of the predetermined irradiation range. Fig. 7C shows an illuminance distribution when the light emitting element arranged at the center of the rectangle is turned on. When one light-emitting device 1B arranged at an end portion other than the corner portion of the rectangle among the plurality of light-emitting devices is turned on as shown in fig. 8A, light mainly passing through lower surface convex portion 14 and light guide portion 21 of first lens 11 is refracted at upper surface convex portion 17, upper surface concave portion 18 and second lens 31 and is irradiated to the rectangular end portion other than the corner portion of the predetermined irradiation range as shown in fig. 8B. Fig. 8C shows the illuminance distribution when the light-emitting elements arranged at the rectangular end portions other than the corner portions are turned on. When one light emitting device 1c arranged at a corner of a rectangle among the plurality of light emitting devices is turned on as shown in fig. 9A, light mainly passing through the lower surface convex portions 14 and the light guide portions 21 of the first lens 11 is refracted at the upper surface convex portions 17, the upper surface concave portions 18 and the second lens 31 and is irradiated to the rectangular corner of a predetermined irradiation range as shown in fig. 9B. Fig. 9C shows the illuminance distribution when the light emitting elements arranged at the corners of the rectangle are turned on.

When all of the plurality of light emitting devices 1a to 1i are turned on, the output of each light emitting device is individually adjusted, whereby an arbitrary illuminance distribution can be generated within a limited power range.

In the light source device 100, the second lens 31 disposed on the emission surface (top surface) side has the fresnel lens surface 32, so that the light emitting devices 1a to 1i inside the light source device 100 can be hardly seen from the outside, and the appearance can be improved.

In the light source device 100, the first lens 11 is fixed to the substrate 41 as described above, and the second lens 31 in which the second body portion 37 is inserted into the opening 52 of the housing 51 is fixed to the first lens 11 fixed to the substrate 41. Therefore, when the light source device 100 is used as a flash light source of a mobile phone or the like, the device thickness H1 of the light source device 100 can be reduced. As a result, the mobile phone can be made thinner.

< second embodiment >

The light source device 100A of the second embodiment has the same configuration as the light source device 100 of the first embodiment, except that the second lens 31 is fixed to the housing 51, and the first side edge portion 25 of the first lens 11A is substantially formed only by the first upper region 25 a. Hereinafter, a description will be given centering on a portion different from the light source device 100, and the same configuration will be omitted as appropriate.

The light source device 100A includes: a substrate 41 on which a plurality of light emitting devices 1A to 1i are mounted, a housing 51 covering the opening 52 and the second lens 31 in a manner facing each other, and a first lens 11A disposed facing the second lens 31. The first lens 11A includes: the light guide unit includes a first main body portion 24 having the incident portion 12 and the light guide portion 21, and a first side edge portion 25A extending laterally from an outer edge of the first main body portion 24. In addition, the first side edge portion 25A has a first upper region 25A. The first lens 11A is connected to the second mounting region 38b of the second lens 31 via the adhesive member 61 in the first upper region 25a, and is disposed apart from the substrate 41. Therefore, the first lens 11A and the second lens 31 can be attached to the housing 51 in a bonded state, and therefore, the manufacturing work efficiency can be improved. Further, the optical axes can be aligned before the first lens 11A and the second lens 31 are attached to the housing 51, so that the adjustment work of the positional relationship can be facilitated, and the optical axis of the first lens 11A and the optical axis of the second lens 31 can be suppressed from being deviated. Further, deterioration in the appearance of the lens due to misalignment of the lenses can be suppressed.

< third embodiment >

The light source device 100B of the third embodiment has the same configuration as the light source device 100 of the first embodiment except that the first lens 11 is fixed to the substrate 41, the second lens 31 is fixed to the housing 51, and the first lens 11 and the second lens 31 are not fixed to each other.

The light source device 100B mounts the second lens 31 on the housing lower surface 51a via the adhesive member 61 on the upper surface of the second mounting region 38B of the second lens 31, and mounts the first lens 11 on the substrate 41 via the adhesive member 61 on the lower surface of the first leg region 25B of the first lens 11. In this way, in the light source device 100B, the first lens 11 is attached to the substrate 41, and the second lens 31 is attached to the housing 51, whereby flexibility in the flow of the manufacturing work can be improved.

< fourth embodiment >

The light source device 100C of the fourth embodiment has the same configuration as the light source device 100 of the first embodiment, except that the transparent member 54 is fitted into the opening 52 of the housing 51, and the second side edge portion 38C of the second lens 31C is substantially formed only by the second leg portion region 38 a. The transparent member 54 is preferably made of glass, transparent resin, or the like.

The light source device 100C includes: the substrate 41 on which the plurality of light emitting devices 1a to 1i are mounted, the housing 51 having the opening 52, the first lens 11, and the second lens 31C, and the transparent member 54 is fitted into the opening 52. In the light source device 100C, the center of the first lens 11 and the center of the second lens 31 are disposed at the center of the transparent member 54. The second lens 31C includes: a second body portion 37 having a fresnel lens surface 32 and a flat surface 36 on the opposite side of the fresnel lens surface 32, and a second side edge portion 38C extending laterally from the outer edge of the second body portion 37.

The second side edge portion 38C includes a second leg portion region 38a extending laterally from the outer edge of the second body portion 37. The second leg portion region 38a is formed such that the lower end surface is located below the fresnel lens surface 32. The second leg portion region 38a is formed in a cylindrical shape on the outer edge of the second body portion 37. The second leg region 38a is formed such that the lower end surface thereof faces the first upper region 25a of the first lens 11.

The second lens 31C is connected to the case lower surface 51a of the case 51 via the adhesive member 61 on the upper surface of the second leg region 38a, and is connected to the first upper region 25a of the first lens 11 via the adhesive member 61 on the lower end surface of the second leg region 38 a. In the first lens 11, the upper surface of the substrate 41 and the lower surface of the first leg region 25b are fixed to each other via the adhesive member 61.

In the light source device 100C, since the transparent member 54 is provided as the protective member, the flat surface 36 of the second lens 31 is not exposed to the outside of the housing 51, and deterioration can be suppressed. When the light source device 100C is used as a flashlight light source of a mobile phone, the transparent member 54, the second lens 31, and the first lens 11 are provided between the light emitting devices 1a to 1i, so that the light emitting devices 1a to 1i inside the light source device 100C can be hardly seen from the outside, and the appearance can be improved. Further, since the light source device 100C is bonded by the adhesive member 61 at a large number of positions, positional deviation due to collision or the like can be prevented.

< fifth embodiment >

Fig. 13 is a sectional view schematically showing the structure of a light source device 100D according to a fifth embodiment.

The light source device 100D of the fifth embodiment has the same configuration as the light source device 100C of the fourth embodiment, except that the second lens 31C is fixed to the housing 51, and the first side edge portion 25A of the first lens 11A is substantially formed only by the first upper region 25A.

The light source device 100D includes: a substrate 41 on which a plurality of light emitting devices 1A to 1i are mounted, a housing 51 covering the opening 52 and the second lens 31C in a manner facing each other, and a first lens 11A disposed facing the second lens 31C, wherein a transparent member 54 is fitted into the opening 52. The first lens 11A includes: the light guide unit includes a first main body portion 24 having the incident portion 12 and the light guide portion 21, and a first side edge portion 25A extending laterally from an outer edge of the first main body portion 24. In addition, the first side edge portion 25A is formed only by the first upper region 25A. Further, the second lens 31C has: a second body portion 37 having a fresnel lens surface 32 and a flat surface 36 on the opposite side of the fresnel lens surface 32, and a second side edge portion 38C extending laterally from the outer edge of the second body portion 37. The second side edge portion 38C has a second leg portion region 38a extending laterally from the outer edge of the second body portion 37.

In the second lens 31C, the case lower surface 51a at the peripheral edge of the opening 52 and the upper surface of the second leg region 38a are fixed to each other via the adhesive member 61 so that the flat surface 36 of the second body 37 faces the transparent member 54. In the second lens 31C, the lower surface of the second leg region 38a of the second side edge portion 38C and the upper surface of the first upper region 25A of the first side edge portion 25A of the first lens 11A are fixed via the adhesive member 61. The first lens 11A and the second lens 31C are preferably arranged so that the center of the transparent member 54, the optical axis center of the first lens 11A, and the optical axis center of the second lens 31C are aligned with each other.

In the light source device 100D, the transparent member 54 can be provided on the housing 51 so as to face the housing lower surface 51A of the housing 51 via the adhesive member 61 in a state where the first lens 11A and the second lens 31C are adhered by the adhesive member 61, and the work efficiency is good.

Further, by easily adjusting the positional relationship between the bonded first lens 11A and second lens 31C in conjunction with the position of the opening 52, it is possible to suppress deviation from the opening 52 and to suppress deterioration of the appearance due to the deviation.

< sixth embodiment >

Fig. 14 is a sectional view schematically showing the structure of a light source device 100E according to a sixth embodiment.

The light source device 100E of the sixth embodiment has the same configuration as the light source device 100C of the fourth embodiment except that the substrate 41 is fixed to the first lens 11, the second lens 31E is fixed to the housing 51, the second side edge portion 38E of the second lens 31 is substantially formed only by the second leg portion region 38a, and the position where the second side edge portion is bonded by the adhesive member 61 is different.

The light source device 100E includes: a substrate 41 on which a plurality of light emitting devices 1a to 1i are mounted, a housing 51 covering an opening 52 facing a second lens 31E, and a first lens 11 disposed facing the second lens 31E, wherein a transparent member 54 is fitted into the opening 52. The first lens 11 includes: a first main body portion 24 having the incident portion 12 and the light guide portion 21, and a first side edge portion 25 extending laterally from an outer edge of the first main body portion 24, the first side edge portion 25 having: a first upper region 25a extending laterally from the outer edge of the first body portion 24, and a first leg region 25b extending from the first upper region 25a toward the substrate 41.

In addition, the second lens 31E has: a second body portion 37 having a fresnel lens surface 32 and a flat surface 36 on the opposite side of the fresnel lens surface 32, and a second side edge portion 38 extending laterally from the outer edge of the second body portion 37. The second lens 31E is disposed such that the flat surface 36 of the second body 37 faces the transparent member 54. In the second side edge portion 38E, the lower surface of the second leg portion 38a is located above the fresnel lens surface 32. The second leg portion region 38a extends laterally from the outer edge of the second body portion 37 and is formed to have a predetermined thickness. In the second lens 31E, the case lower surface 51a at the periphery of the opening 52 and the upper surface of the second leg region 38a are fixed via the adhesive member 61. In order to protect the fresnel lens surface 32, the lower surface of the second leg portion 38a may be located below the fresnel lens surface 32.

In the first lens 11, the upper surface of the substrate 41 and the lower surface of the first leg region 25b are fixed to each other via the adhesive member 61. The second lens 31E is connected to the housing lower surface 51a by an adhesive member 61 so as to be disposed at a predetermined interval from the first lens 11. The first lens 11 and the second lens 31E are preferably arranged such that the optical axis centers thereof are aligned with the center of the transparent member 54.

In the light source device 100E, the first lens 11 is attached to the substrate 41 side, and the second lens 31E is attached to the housing 51 side, so that the first lens 11 and the second lens 31E can be easily replaced individually. In the light source device 100E, since the second lens 31E is attached to the housing 51, the second lens 31E and the housing 51 are easily coupled to each other, and positional deviation can be suppressed, thereby improving the appearance.

< seventh embodiment >

Fig. 15 is a sectional view schematically showing the structure of a light source device 100F according to a seventh embodiment.

The light source device 100F of the seventh embodiment has the same configuration as the light source device 100C of the fourth embodiment, except that the second lens 31C fixed to the first lens 11 fixed to the substrate 41 is not fixed to the housing 51.

In the light source device 100F, the second lens 31C fixed to the first lens 11 is not fixed to the housing 51, and therefore the first lens 11 and the second lens 31C can be replaced at the same time. In the light source device 100F, the first lens 11 is fixed to the substrate 41, and then the second lens 31C can be fixed to the first lens 11 fixed to the substrate 41. That is, the second lens 31C can be disposed after the first lens 11 is disposed at a position where the light-emitting device 1 is coupled. This can prevent deterioration of optical characteristics and degradation of appearance caused by misalignment between the optical axis of the light-emitting device 1 and the center of the lens.

< eighth embodiment >

Fig. 16 is a sectional view schematically showing the structure of a light source device 100G according to the eighth embodiment.

The light source device 100G of the eighth embodiment has the same configuration as the light source device 100F of the seventh embodiment, except that the second lens 31C is not provided and the upper surface of the first lens 11B fixed to the substrate 41 is formed of the fresnel lens surface 32. In addition, in the light source device 100G, the fresnel lens surface 32 has: a central convex portion 33 which is an output surface and is convex on the case 51 side, and a plurality of annular convex portions 34 which are arranged concentrically along the shape of the central convex portion 33 and are convex on the case 51 side. In the light source device 100G, since the first lens 11B has the fresnel lens surface 32, the thickness of the entire light source device can be made thinner than that of the light source device 100F. Therefore, when the light source device 100G is used as a flash light source of a mobile phone or the like, the thickness of the light source device 100G can be further reduced, which contributes to the reduction in thickness of the mobile phone.

In the light source device 100G, the first lens 11B has: a lower surface formed by the incident portion 12 and the light guide portion 21, and an upper surface formed by the fresnel lens surface 32. Therefore, in the light source device 100G, since the light from the light emitting device 1 is introduced from the lower surface of the first lens 11B without loss, the light loss can be reduced, and the size of the opening 52 of the housing 51 can be directly reduced, so that the light emission efficiency can be improved, and the wide-angle light distribution can be controlled. Further, the light source device 100G can suppress deterioration of optical characteristics and appearance of the light emitting device 1 due to misalignment between the optical axis and the center of the first lens 11B.

< ninth embodiment >

Fig. 17A is a sectional view schematically showing the structure of a light source device 100H according to a ninth embodiment. Fig. 17B is a plan view of the light source device 100H of the ninth embodiment, as viewed from the light emitting device side of the first lens 11C.

A light source device 100H according to the ninth embodiment has the same configuration as the light source device 100D according to the fifth embodiment except that the second lens 31C is not provided, the upper surface of the first lens 11C fixed to the housing 51 is formed by the fresnel lens surface 32, and the lower surface of the first lens 11C has a two-fold rotational symmetry shape which is more complicated than four-fold rotational symmetry in plan view.

In addition, in the light source device 100H, the fresnel lens surface 32 has: a central convex portion 33 which is an output surface and is convex on the case 51 side, and a plurality of annular convex portions 34 which are arranged concentrically along the shape of the central convex portion 33 and are convex on the case 51 side. In addition, in the light source device 100H, since the first lens 11C has the fresnel lens surface 32, the thickness of the entire light source device can be made thinner than that of the light source device 100D. Therefore, when the light source device 100H is used as a flash light source of a mobile phone or the like, the thickness of the light source device 100H can be further reduced, which contributes to the reduction in thickness of the mobile phone.

In the present embodiment, as shown in fig. 17B, the lower surface of the first lens 11C is viewed in plan as a two-fold rotationally symmetric shape. When the light source device of the present embodiment is used as a flash light source of a camera, it is considered that the imaging angle of view of the camera is 16: 9. 4: 3, and the lower surface of the first lens element 11C is preferably a quadratic rotationally symmetrical shape in plan view. The lower surface of the first lens 11C may be regarded as a four-fold rotationally symmetrical shape in plan view.

In the light source device 100H, the positional relationship of the first lens 11C can be easily adjusted in accordance with the position of the opening 52, and thus, the deviation from the opening 52 can be suppressed, and the deterioration of the appearance can be suppressed.

Examples

Next, an optical simulation performed using the light source device model of the embodiment will be described. The light source device is not limited to the following embodiments.

Fig. 18A is a schematic diagram showing a lighting state of the light emitting devices in the light source device of the embodiment, and showing a case where all of the nine light emitting devices 1a to 1i are turned on. Fig. 18B is a schematic diagram showing an illuminance distribution of the light source device of fig. 18A. Fig. 19A is a schematic diagram showing a lighting state of the light emitting devices in the light source device of the embodiment, and showing a case where eight light emitting devices 1a to 1d, 1f to 1i among the nine light emitting devices 1a to 1i are already lit. Fig. 19B is a schematic diagram showing an illuminance distribution of the light source device of fig. 19A. Fig. 20A is a schematic diagram showing a lighting state of the light emitting devices in the light source device of the embodiment, and showing a case where five light emitting devices 1a to 1c, 1f, 1i among the nine light emitting devices 1a to 1i are lighted. Fig. 20B is a diagram showing an illuminance distribution of the light source device of fig. 20A. In fig. 18A, 19A, and 20A, the lighting state and the lighting-out state of the light-emitting device are shown in black and white.

Based on the configuration of the light source device 100 of the embodiment shown in fig. 1, how light from the light emitting devices 1a to 1i is irradiated via the first lens 11 and the second lens 31 is obtained by simulation.

In the light source device 100 model of the embodiment, it is assumed that the light emitting surface of each light emitting device is a square with one side of 0.5 mm. The light emitting devices 1a to 1i are arranged so as to coincide with the following coordinates with the center of the light emitting surface of the light emitting device 1e, which is the center of the light emitting surface of the nine light emitting devices 1a to 1i arranged in a rectangular shape in plan view, being the origin. The following coordinate unit is mm.

Center of light emitting surface of light emitting device 1 a: (-0.55,0.55)

Center of light emitting surface of light emitting device 1 b: (0,0.55)

Center of light emitting surface of light emitting device 1 c: (0.55)

Center of light emitting surface of light emitting device 1 d: (-0.55,0)

Center of light emitting surface of light emitting device 1 e: origin (0, 0)

Center of light emitting surface of light emitting device 1 f: (0.55,0)

Center of light emitting surface of light emitting device 1 g: (-0.55 )

Center of light emitting surface of light emitting device 1 h: (0, -0.55)

Center of light emitting surface of light emitting device 1 i: (0.55, -0.55)

In the light source device 100 of the embodiment, as shown in fig. 1 and 5, the first lens 11 has, on its lower surface: an incident portion 12 formed of a lower surface convex portion 14 disposed at the center of the lower surface in a plan view and formed in a square shape with one side of 0.57mm, and a corner portion 16 continuous to the outer periphery of the lower surface convex portion 14 and disposed in a square ring shape with a width of 0.19 mm; and light guide portion 21 which is continuous with the outer periphery of corner portion 16 and is arranged in a square ring shape with a width of 0.49 mm. In addition, the first lens 11 has, on its upper surface: an upper surface convex portion 17 formed in a square shape with one side being 0.71mm and arranged at the center of the upper surface in a plan view, and a flat portion 19 arranged in a square ring shape with a width of 1.3mm via an upper surface concave portion 18 continuous with the upper surface convex portion 17.

In the light source device 100 of the embodiment, as shown in fig. 6, the second lens 31 has a fresnel lens surface 32 on its lower surface. The second lens 31 has: the lens is characterized in that the lens comprises a central convex part 33 which is arranged at the center of a Fresnel lens surface 32 and is formed into a circular shape with a radius of 0.45mm in a plan view, a convex part 34 which has a vertex at a position with a radius of 1.5mm farthest from the center of the Fresnel lens surface and is arranged concentrically with the central convex part 33, and a plurality of convex parts 34 which are arranged between the convex part 34 and the central convex part 33 and are arranged concentrically with the central convex part 33 at equal intervals. The upper surface of the second lens 31 has a flat surface 36 formed in a circular shape with a radius of 1.77mm in a plan view. It is assumed that the light source device 100 of the embodiment has four convex portions 34.

Using the model of the light source device 100 of the example, the illuminance distribution when all or a part of the light emitting devices 1a to 1i were turned on was obtained by simulation under the following measurement conditions.

(measurement conditions)

Size of the evaluation light receiver: 280 x 370mm

Distance between light-emitting device and evaluation light receiver: 300mm

Viewing angle of the evaluation light receiver: 75 degree

Distance between the top surface of the light emitting device and the first lens: 0.1mm

As shown in fig. 18A to 20B, it was confirmed that the light source device 100 of the embodiment can obtain an illuminance distribution corresponding to the lighting position. Further, it was confirmed that the light source device 100 of the embodiment can increase the illuminance difference between the illuminance within the desired irradiation range and the illuminance outside the illuminance range when light is irradiated to the desired irradiation range. In the light source device 100, since light is irradiated through the first lens 11 and the second lens 31, the light is irradiated in accordance with the refraction direction of the lenses.

It was also confirmed that when all of the nine light emitting devices 1a to 1i shown in fig. 18A are turned on, an arbitrary illuminance distribution can be generated within a limited power range by adjusting the output of each light emitting device. For example, when a flash lamp whose center is brighter is required, a flash lamp whose center illuminance is high and which is brighter can be obtained by inputting more electric power to one light-emitting device 1e arranged in the center of the rectangle. In addition, even when uniform illumination over a wide range is desired, a uniform illuminance distribution can be generated by balancing the power input from each light source. It is confirmed that, when the same input power (the same luminance) is generally input to all of the light emitting devices 1a to 1i, the illuminance distribution is formed such that the vicinity of the rectangular center portion where the light emitting devices are densely packed is bright and the rectangular corners and the rectangular ends are dark, and therefore, by reducing the power input to the light emitting device 1e arranged at the rectangular center portion and increasing the power input to the light emitting devices 1a to 1c, 1d, 1f, and 1g to 1i arranged at the rectangular corners and the rectangular ends, a more uniform illuminance distribution can be obtained.

The respective configurations described above may be variously modified. For example, the number of corners 16 of the fresnel lens surface may be increased in the first lens, or the curvature of the fresnel lens surface may be changed as appropriate. In addition, when the first lens is formed as a TIR lens surface, the angle of elevation of the corner portion 16 and the angle of the inclined surface may be appropriately changed. Further, the flat surface of each second lens is made to be the same plane as the surface of the housing, but a protection sheet may be attached to the flat surface so that the protection sheet is made to be the same plane as the housing.

Description of the reference numerals

1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i light emitting device; 2 a light emitting element; 3, an electrode; 4a light-transmitting member; 5 covering the component; 11, 11A, 11B, 11C first lens; 12 an incident part; 14 lower surface convex parts; 16 corner portions; 17 upper surface convex parts; 18 upper surface recesses; 19a flat portion; 21 a light guide part; 22 inner side surface; 23 inclined plane; 24, 24A first body portion; 25, 25A, 25B, 25C; 25a first upper region; 25b a first foot region; 31, 31C, 31E second lens; 32 fresnel lens faces; 33 a central convex portion; 34 a convex part; 36 flat faces; 37 a second body portion; 38, 38C, 38E second side edge portion; 38a second foot region; 38b a second mounting area; 41 a substrate; 42 wiring; 51a housing; 51a lower surface of the housing; 52 an opening part; 53 feet; 54 a transparent member; 61 an adhesive member; 62 a conductive adhesive member; 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H light source devices.

Claims

1. A light source device is characterized in that a light source unit,

comprising: a plurality of light emitting devices capable of lighting independently, a first lens disposed to face the plurality of light emitting devices, and a second lens disposed to face the first lens,

a lower surface of the first lens facing the plurality of light emitting devices includes: an incident portion disposed at the center and into which light from the plurality of light emitting devices is incident, and a light guide portion disposed outside the incident portion and guiding the light incident from the incident portion,

the second lens has a Fresnel lens surface formed by a plurality of annular convex portions on a lower surface facing the first lens.

2. The light source device according to claim 1,

the incident portion is a concave portion formed on a lower surface of the first lens.

3. The light source device according to claim 2,

the lower surface of the first lens has a lower surface convex portion protruding toward the light emitting device side on the bottom surface of the concave portion.

4. The light source device according to any one of claims 1 to 3,

the lower surface of the first lens is viewed as a four-times rotationally symmetric shape when viewed from above.

5. The light source device according to claim 4,

the lower surface of the first lens is viewed in a rectangular shape as viewed from above.

6. The light source device according to any one of claims 1 to 5,

the upper surface of the first lens has: the upper surface convex part is arranged at the center, and the flat part is arranged through the upper surface concave part continuous with the upper surface convex part.

7. The light source device according to any one of claims 1 to 6,

the plurality of light emitting devices are arranged in a rectangular shape in a plan view as a whole.

8. The light source device according to any one of claims 1 to 7,

further comprising: a substrate on which the plurality of light emitting devices are mounted, and a housing that covers the opening portion so as to face the second lens,

the first lens is fixed on the substrate.

9. The light source device according to any one of claims 1 to 7,

the second lens is fixed to the housing.

10. The light source device according to any one of claims 1 to 7,

the first lens is fixed on the substrate, and the second lens is fixed on the shell.

11. The light source device according to claim 8 or 9,

the first lens has: a first main body portion having the incident portion and the light guide portion, and a first side edge portion extending laterally from an outer edge of the first main body portion,

the second lens has: a second body section having the Fresnel lens surface and a flat surface facing the opening on the side opposite to the Fresnel lens surface, and a second side edge section extending laterally from the outer edge of the second body section,

the upper surface of the first side edge portion and the lower surface of the second side edge portion are fixed via an adhesive member.

12. A light source device is characterized in that a light source unit,

comprising: a plurality of light emitting devices capable of independently lighting, and a first lens arranged to face the plurality of light emitting devices,

a lower surface of the first lens facing the plurality of light emitting devices includes: an incident portion disposed at the center of the lower surface and into which light from the plurality of light emitting devices is incident, and a light guide portion disposed outside the incident portion and guiding the light incident from the incident portion,

the upper surface of the first lens on the opposite side of the lower surface has a Fresnel lens surface formed by a plurality of annular convex portions.

13. The light source device according to claim 12,

further comprising: a substrate on which the plurality of light emitting devices are mounted, and a housing that covers the opening portion so as to face the first lens,

the first lens is fixed on the substrate.

14. The light source device according to claim 12,

the first lens is fixed to the housing.

15. The light source device according to claim 13 or 14,

the first lens has: a first body portion having the incident portion, the light guide portion, and a fresnel lens surface; and a first side edge portion extending laterally from an outer edge of the first body portion.